BRAD / PITT(1D. With 59-Down, star of the work, revealed by the first letters of the Across clues, which hint at this puzzle’s theme), e.g., THE ROBERT REDFORD FILM “A RIVER RUNS THROUGH IT”, along withRED RIVER, WILD RIVER, MOON RIVER, RIO BRAVO and THE BRIDGE / OVER THE / RIVER KWAI, constitutes the interrelated group of this smooth-flowing Tuesday crossword.